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although no one seems to know what it might mean
in itself, its pretty typical for a plane to drop off from ADSB coverage when flying over remote areas. ADBS is only good for about ~200mi line of sight at absolute tops and receiver coverage tends to be heavily concentrated in urban areas.
Edit: Also worth pointing out that military planes only fly with ADSB beacons on if they want to be trackable by civilians.
Stonehedge
jv
Seemingly odd things going on in the skies over Russia today:
https://twitter.com/OAlexanderDK
although no one seems to know what it might mean